A kid is 1 to 12, reminds me of when i played a lot of golf when i was 45 to 55, sometimes played with guys who were in their 70's. They would say the same thing, i just told them we are all old, some just older. For the mountains i am looking into putting a 28 ring for my triple OCR3. Its should be enough, i hope. My lowest GI is 47, i need to be in the 20s somewhere to do the mountains.